New infrared imaging diagnostic for the Neutral Beam Heating System at the TJ-II stellarator

An upgraded infrared imaging system has been installed at the stellarator TJ-II as a diagnostic tool of the Neutral Beam Injection heating. Thermographic analysis of the beam-wall interaction areas can be used to estimate the beam power lost through reionization and shine-through mechanisms in Neutr...

Full description

Saved in:
Bibliographic Details
Published in:Journal of instrumentation 2019-09, Vol.14 (9), p.C09028-C09028
Main Authors: Liniers, M., Quintana, J.A., Rojo, B., Martín-Díaz, F., Miguel, F., Sebastián, J.A., Carrasco, R., Soleto, A., Sánchez-Sarabia, E., Jiménez-Denche, A., Pastor, C., Rodríguez, C., Guasp, J., de la Cal, E., McCarthy, K.J., Pastor, I., Ascasíbar, E.
Format: Article
Language:English
Subjects:
Beam injection
Design optimization
Diagnostic software
Diagnostic systems
Field of view
Heating
Infrared cameras
Infrared imaging
Infrared imaging systems
Ionization
Neutral beams
Optical design
Plasmas
Thermography
Upgrading
Vignetting
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An upgraded infrared imaging system has been installed at the stellarator TJ-II as a diagnostic tool of the Neutral Beam Injection heating. Thermographic analysis of the beam-wall interaction areas can be used to estimate the beam power lost through reionization and shine-through mechanisms in Neutral Beam heated plasmas. Three different Regions of Interest inside TJ-II vacuum vessel have been determined whose thermographic analysis will be applied to the study of beam related processes. The optical conditions required for each application have been used to define the specifications of the IR camera. Optimization of the optical design has been carried out by means of the optical simulation code ZEMAX. The IR window size has been increased to maximize the fraction of the field of view that is free from vignetting. The system has been fully commissioned and is now operative, routinely providing thermographic data of the regions of interest during the last TJ-II experimental campaign. The IR diagnostic is described in detail and its applicability to study beam power deposition on different targets is discussed.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/14/09/C09028